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Business Combinations - Additional Information (Detail) - SEK (kr) kr in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 21, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Business Combinations [Line Items] |  |  |  |
Cash flow effect pursuant to business combinations |  | kr 141 | kr 1,309 |
Goodwill |  | kr 1,260 | 31,897 | kr 0
Enterprise [Member] |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |
Business acquisition, ownership percentage |  | 83.30% |  |
Divestments [Member] |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |
Cash flow effect pursuant to business combinations |  | kr 0 | (633) |
Vonage Holdings Corp [member] |  |  |  |
Disclosure Of Business Combinations [Line Items] |  |  |  |
Date of acquisition | Jul. 21, 2022 |  |  |
Intangible assets |  | 13,800 |  |
Goodwill |  | kr 900 | kr 31,900 | kr 15,300

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- Definition The date on which the acquirer obtains control of the acquiree in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B64 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_b&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2024-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2024-03-27 + Details
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